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1.
王娜  乔生儒  杨斌 《有色金属》2007,59(4):31-35
将改性后纳米TiO2在单体乙二醇(EG)中超声分散30min,并与对苯二甲酸(TPA)混合后放人反应釜中,采用先酯化后缩聚的工艺制备PET/纳米TiO2复合材料。用特性黏度、红外光谱、SEM和DSC分析PET及PET/纳米TiO2复合材料。结果表明,PET中加入纳米TiO2后,没有新的化学键形成,纳米TiO2与PET的相互作用主要是物理作用,其相对黏度及特性黏度都有所增加。纳米TiO2和分散剂PEG同时加入EG后用超声波分散,可以明显改善其分散性。纳米TiO2加入PET中起到了异相成核作用。PET/纳米TiO2复合体系只有TiO2含量为3%对的过冷度明显减小,结晶能力增强。  相似文献   

2.
罗皓月  孙红娟  吕霞  岳萍 《非金属矿》2012,35(5):10-12,39
以钠化蒙脱石和硫酸氧钛为原料,采用水解沉淀法制备TiO2/蒙脱石复合材料,通过X射线衍射(XRD)和光催化亚甲基蓝溶液对其物相组成及转变、光催化性能进行了研究.结果发现,TiO2/蒙脱石复合物能使TiO2相变温度增大,表明包覆在蒙脱石表面及进入层间域的TiO2较纯TiO2更稳定.光催化结果表明,1100℃下焙烧的TiO2/蒙脱石复合物光催化效果较纯TiO2好,可制成环保高温陶瓷的表面,对空气进行净化,为研究新型环保陶瓷提供了方向.  相似文献   

3.
论述了聚乙二醇在TiOSO4 常温氨水水解反应制备纳米TiO2 粉末中的作用 ,并对不同制备条件及热处理温度下的纳米TiO2 粉末结构、粒径大小和比表面积进行了表征。讨论了水解时聚乙二醇的加入与否和煅烧条件对纳米TiO2 粉末的团聚作用 ,以及对晶型转变温度、粒径大小、比表面积等因素的影响。结果表明 :水解时加入聚乙二醇制得的纳米TiO2 粉末团聚作用小 ,颗粒为球形 ,平均粒径为 7.4nm ,平均比表面积为 1 1 6.5 5m2 /g ,最高比表面积达 1 60 .92m2 /g。  相似文献   

4.
空心微珠为基核的纳米隐形材料的制备研究   总被引:10,自引:0,他引:10  
杜玉成  龚先政  黄坤良 《矿冶》2002,11(1):71-73
叙述了纳米金属微粒及金属氧化物微粒的吸波隐形原理和空心微珠为基核载体 ,表面镀覆纳米金属微粒Cu、Ni及金属氧化物微粒TiO2 ,制备隐形材料的工艺过程。作为吸波材料的基体 ,空心微珠的粒度 0~ 10 μm较好 ,控制一定的金属置换与沉降速度 ,可获得在 470~ 35 0 0nm、389~ 415nm波长内具有较高吸收率 (>85 % )的空心微珠镀Cu、Ni、TiO2 的吸波材料  相似文献   

5.
空心微珠为基核的纳米隐形材料的制备研究   总被引:6,自引:0,他引:6  
本文叙述了纳米金属微粒及金属氧化物微粒的吸波隐形原理、空心微球为基核载体,表面镀覆纳米金属微粒Cu,Ni及金属氧化物微粒TiO2,制备隐形材料的工艺过程,作为吸波材料的基体,空心微球的粒度1-10μm较好,控制一定的金属置换与沉降速度,可获得在470-3500nm,389-415nm波长内具有较较吸收率的空心微球镀Cu,Ni,TiO2的吸波材料。  相似文献   

6.
通过插层法和溶胶-凝胶法制备了PVA/MMT/TiO2三元复合薄膜。结果表明,MMT、TiO2均匀分散于基体中,由于无机柱子的协同增强作用.PVA/MMT/TiO2三元复合薄膜的热分解温度比纯PVA薄膜提高了59℃:MMT的质量一定时.复合薄膜的拉伸强度、直角撕裂强度和弹性模量随TiO2质量分数的增加而增加。并在TiO2质量分数为1.0%时分别达到最大值,但断裂伸长率则一直下降.MMT质量分数为3.0%、TiO2质量分数为1.0%、pH为7、搅拌3h和反应温度90℃条件下.制得的复合薄膜的性能最佳。  相似文献   

7.
通过光降解甲基橙实验,研究了利用溶胶-凝胶法制备出的黑电气石/TiO2/稀土离子(Nd3+,Gd3+)复合材料的光催化效率。探讨了黑电气石掺量、稀土离子(Nd3+,Gd3+)掺量和甲基橙初始浓度对降解率的影响,并分析了黑电气石和稀土离子对光催化反应的作用机理。结果表明,黑电气石和稀土元素的加入显著提高了TiO2的光催化效率,复合材料对甲基橙的最高降解率比纯TiO2提高了约26%。Nd3+、Gd3+与黑电气石的最佳掺量分别为0.15%、0.10%和1.5%。  相似文献   

8.
本文利用Raman光谱对TiO2/白云母纳米复合材料中TiO2纳米镀层的相转变和相组成进行了研究.结果表明:对于纯纳米TiO2,在导晶剂Sn^4 使用适量时,无定形纳米Ti(OH)4在热处理过程中不经过锐钛矿相而直接生成金红石相;对于TiO2/白云母纳米复合材料,TiO2纳米镀层仍然是以金红石相占优势的金红石、锐钛矿的混合相。TiO2纳米镀层的Raman光谱显示出强烈的Raman散射,证实了TiO2纳米镀层的多晶特征。随纳米镀层厚度增大,TiO2的颗粒粒度增大,结晶度提高。  相似文献   

9.
为提高TiO2光催化性能,以黑电气石、钛酸四丁酯和稀土氧化物(Nd2O3、Gd2O3为原料,采用溶胶-凝胶法制备黑电气石/TiO2/稀土离子(Nd3+,Gd3+)复合材料,借助X射线衍射(XRD)和扫描电子显微镜(SEM)对该复合材料进行了物相分析和微观结构分析.结果表明,500℃煅烧后生成的TiO2属锐钛矿相,TiO2粒径均在纳米尺度,且成功包覆于黑电气石表面,说明制备工艺及反应条件控制合理.  相似文献   

10.
Ni Ti形状记忆合金因具有独特的形状记忆效应和优异的机械性能,而在消防领域具有重要的应用。针对Ni Ti合金在消防领域中常会处于高温环境这一情况,利用差示扫描量热仪(DSC)、X射线衍射(XRD)和高分辨率透射电子显微镜(HRTEM)多种表征手段,分析Ni Ti合金的相变行为和微观结构,研究Ni Ti形状记忆合金的高温力学性能。  相似文献   

11.
正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium  相似文献   

12.
<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy  相似文献   

13.
正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared  相似文献   

14.
<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth  相似文献   

15.
正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products  相似文献   

16.
文奇 《中州煤炭》2018,(6):175-178
高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。  相似文献   

17.
<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why  相似文献   

18.
正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.  相似文献   

19.
<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel  相似文献   

20.
正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.  相似文献   

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